Question

Angle a, b and c of a triangle are in ratio 6:4:5 what is the valve of angle b?

Answer 1

A triangle has 180° total internal angle. The number 4 in the ratio means that 4/(6+4+5) = 4/15 of the total internal angle is made of angle b.

This means that angle b = 4/15 * 180° = 48°.